*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19723
19730
19740
19750
19760
19770
19780
19790
19800
19811
19820
19830
19844
19854
19868
198715
198840
198943
19906
19915
19924
19934
19940
19953
19960
19974
19980
19991
20000
20017
20027
200310
20046
200510
200610
20078
200812
200910
20107
20118
20128
201310
201413
201510
201616
201710
20180
Total308